similar to: net.ipv4 TCP/IP Optimizations = sysctl.conf?

I get these errors from the following settings in /etc/sysctl.conf file: # Custom Settings: net.ipv4.tcp_max_syn_backlog=2048 net.ipv4.tcp_fin_timeout=30 net.ipv4.tcp_keepalive_intvl=10 net.ipv4.tcp_keepalive_probes=7 net.ipv4.tcp_keepalive_time=1800 net.ipv4.tcp_max_tw_buckets=360000 net.ipv4.tcp_synack_retries=3 net.ipv4.tcp_rmem="4096 87380 16777216" net.ipv4.tcp_wmem="4096

I am running OpenSSH_6.7p1 on Slackware 14.1 x64. I haven't modified a stock config. On Linux TCP timeouts are controlled by these 3 files: $ cat /proc/sys/net/ipv4/tcp_keepalive_time \ > /proc/sys/net/ipv4/tcp_keepalive_intvl \ > /proc/sys/net/ipv4/tcp_keepalive_probes 7200 75 9 These are their default values. I modified them to 3, 1, 1 respecitively before establishing a new SSH

Hey I need to run some pgp commands, -what's the name of the package supported by Centos that will allow me to work with pgp? I need to run pgp --fingerprint key.name or it's equivalent. Pro question. Google searches didn't show much, tried to search for pgp, gnupg, openpgp, pgp on centos, openpgp on centos, centos/pgp. No worthy results came back. Any advice? -karlski

Hi *Problem *- I'm running Icecast in a VM container on OpenVZ. Syslog on the hardware node (HN) shows these error messages: Jan 23 18:43:05 HN kernel: [27469893.430615] possible SYN flooding on port 8000. Sending cookies. Jan 23 21:37:40 HN kernel: [27480362.817944] possible SYN flooding on port 8000. Sending cookies. Jan 23 23:43:50 HN kernel: [27487929.582025] possible SYN flooding on

To extend space on our 64-bit centos FTP servers, we are considering setting them up to work with an existing PromiseRAID system via iscsi. -just curious if anyone here knows if iScsi is fast enough to serve up all the images? -might it be something where we get dedicated cards and put the iScsi traffic on its own Vlan? Just curious if this would hold up under alot of traffic, like weather

hey I already compiled apache 2.0.58 from source onto my centos server and noticed I needed to get SSL module added "after the fact" -what are the commands I would run to get this working without wiping everything out and starting over? -karlski

Howdy all, Any recommendation as to the right way to config X. Last time I did was using X86Setup back in OpenBSD 2.7 days. What's the Xorg tool? How do I invoke it? Looks like I just need to fix the ranges, maybe they mean sync vert & horiz or something. Or should I be typing gdm instead of startx? Any advice? -below are some errors, infos, although the dmesg didn't pipe out

Hi, Whats' the best motherboard you ever ran CentOS on? --------- Don't read this unless you have lots o' spare time, and please, no flamers or kook-jobs with wierd attitudes, this is just plain old hardware as it relates to centos talk -no politic or mean folks. Background (why I ask about centos-friendly hardware): As I order alot of servers, I have alot of vendors telling me

Hello! Hardver: Windows XP Compaq Proliant DL360, Linux Compaq Proliant DL380. 2 pieces of processors Intel Xeon 3,2GHz, 2GB RAM, 6 gigabit interface (2 tg3, 4 e1000), Debian Woody, 2.4.31 vanilla kernel. 6 U320 SCSI 15krpm HDD, 2 HDD RAID1 system, 4 HDD RAID1+0 data. Every network cards connect at speed of 1000MB full duplex, with XP crosscable (but we've tried with gigabit switch, too, we

https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=40 laforge@netfilter.org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED ------- Additional Comments From laforge@netfilter.org 2003-02-03 16:49 ------- We haven't seen this

Just wanted to see if this tool was approved or disapproved of in the centos community as far as security is concerned. http://www.ispconfig.org/ I have noted that anything that is not a centos package is probably suspect, -so feel free to assure, or warn, at your leisure. Basically we are looking for a secure GUI based DNS admin tool, (I myself prefer an openbsd or centos dns machine and tyo

I'm trying to install either 32-bit or 64 bit centos 4.3 and I keep getting an error: "No valid devices were found on which to install filesystems". In checking BIOS and RAID, everything seems fine, but I just found some research about I20. An alternative would be the i2o_blocks module. How can I install CentOS 4.3 x86_64 using i2o_blocks? How do I instruct the boot prompt to

Hi, I have downloaded several different sets of the 64-bit ISOs, and have burned them to CD using various of my known-good ISO burning softwares, including Nero and DeepBurn on Windows, as well as the native CD burning KDE linux tool on Xandros Linux. I am using mirrors from the site, like kernel.org. I have chosen low burning speeds also, but when I insert the ISO CD into a server and boot it

Hi, I literally have about 36 machines running CentOS on a private network, and will probably change the remaining 30 or so away from Whitebox or RH in the near term. One thing I just noticed was when I tried to search out Tripwire RPM's, that none seemed evident. Can anyone point me in the direction of an Tripwire RPM that works with CentOS 4.3, or advise me on how to create one from the

Hi all: I have some kvm host(rhel 6.4, 2.6.32-358.0.1.el6.x86_64), I ran several windows guest on it(more than 10 guest on one host and the guest os are win7-32/win7-64/win2k8), but the guest network kept down automatically, lost package. I tried virtio drive and e1000 drive,but it didn't work. However, when I run cmd.exe ping some other subnet ip it worked. The host and guest are connected by

Hi, Running a bunch of CentOS servers on 2U supermicro equipment, usually with 8 drives on Adaptec SmartRAID V or LSI Megaraid. In designing a rack in a data center, the question arises as to how to measure the amperage the server uses, prior to investing in power drops that actually do that for you, even remotely, for about $260.00-300USD per unit. This number is the important one these days

I have four NFS servers running on Dell hardware (PE2900) under CentOS 5.7, x86_64. The number of NFS clients is about 170. A few days ago, one of the four, with no apparent changes, stopped responding to NFS requests for two minutes every half an hour (approx). Let's call this "the hang". It has been doing this for four days now. There are no log messages of any kind pertaining

Hi, after reading the docs (no man page) and seeing a few example howtos, I see none for Centos specifically. I hereby offer to write this and even host it, and any other wiki-able howto you want, if you can school me on the first few steps relevant to how to link up the current rpmforge rpm for RHEL4-64. See, right now, the one for centos loads into the /usr/share/doc, which is an odd place

while i'm on a Centos5 kick, I was just curious if I simply needed to add a repo or if building these was a matter of waiting in terms of Centos5. Am trying hard to stay away from Fedora if possible... -krb

Hi, What's the best/safest way to "cat" the following job into crontab? */3 * * * * /usr/lib64/nagios/plugins/check_megaraid_passive.sh > /dev/null 2>&1 I am used to doing this manually via crontab -e, but now I simply have too many centos servers to build in a given week (get to toss another 120K at some more 2U chenbro/tyan/amd64's -w000ooo). -karlski